Now

1. Existing at the present time; present.
2. At the present time; at this moment; at the time of speaking; instantly; as, I will write now.
3. Very lately; not long ago.
4. At a time contemporaneous with something spoken of or contemplated; at a particular time referred to.
5. The present time or moment; the present.
6. In present circumstances; things being as they are; -- hence, used as a connective particle, to introduce an inference or an explanation.